netdev - Re: [PATCH bpf-next v7 0/7] libbpf: Implement BTFGen

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Date:   Thu, 17 Feb 2022 17:07:15 -0500
From:   Mauricio Vásquez Bernal <mauricio@...volk.io>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Quentin Monnet <quentin@...valent.com>,
        Rafael David Tinoco <rafaeldtinoco@...il.com>,
        Lorenzo Fontana <lorenzo.fontana@...stic.co>,
        Leonardo Di Donato <leonardo.didonato@...stic.co>
Subject: Re: [PATCH bpf-next v7 0/7] libbpf: Implement BTFGen

>
> Fixed up few things I pointed out in respective patches. Applied to
> bpf-next. Great work, congrats!

Thanks a lot for all your patience and helpful reviews!

>
> It would be great as a next step to add this as (probably optional at
> first) step for libbpf-tools in BCC repo, so that those CO-RE-based
> tools can be used much more widely than today.

I like this idea. It'll also help us to understand and improve the way
to ship those files within the application.

> How much work that
> would be, do you think?

Probably the most difficult part is to embed the generated files into
the executable. I think generating a header file with the BTF info for
each tool and some helpers to extract it at runtime according to the
kernel version should work.

> And how slow would it be to download all those
> BTFs and run min_core_btf on all of them?

The whole thing takes like 5 minutes on my system (AMD Ryzen 7 3700X
with 60mbps connection), given that almost 3 minutes are spent
downloading the files I'd say that with a fast connection and some
performance improvements (multicore?) it could take around 2~3
minutes.

Let me think better about this integration and will be back with some ideas.